JP7298368B2 - Image reader - Google Patents

Description

The present invention relates to an image reading apparatus for reading an image of a document.

2. Description of the Related Art An image reading device represented by a scanner or the like has a document reading sensor arranged in a transport path for transporting a document, and is configured to read an image of the document while the document is being transported, as disclosed in Japanese Patent Application Laid-Open No. 2002-200013. There is also a sheet-fed type, and such scanners are sometimes called document scanners.

JP 2014-058356 A

In the above sheet feed type scanner, the glass that constitutes the reading unit equipped with the document reading sensor is charged, and when the glass exceeds the charge tolerance, the static electricity is discharged into the reading sensor by the discharge from the glass. may enter and damage the reading sensor.
In order to avoid such a problem, if a static elimination member is provided around the glass, a separate work for connecting the static elimination member and GND is required, which increases the number of man-hours and required members, resulting in an increase in cost.

In order to solve the above problems, the image reading apparatus of the present invention comprises a document transport path through which a document is transported, a transparent plate facing the surface of the document transported through the document transport path, and a document through the transparent plate. a reading unit having a reading sensor that reads the surface of the reading unit, the reading unit including a housing that houses the reading sensor and in which the transparent plate is provided at a position facing the document transport path; A circuit board provided on the side opposite to the position where the transparent plate is provided with respect to the sensor and processing an output signal of the reading sensor; and a surface extending in a first direction that is a direction of separation, and a first end that is one end in the first direction faces the transparent plate and is attached to a second end that is the other end in the first direction. A conductive plate material having a contact portion that contacts a shield member is provided inside the housing, the circuit board has a GND pattern connected to GND, and the shield member is connected to the circuit board. It is characterized by being in contact with a GND pattern.

3 is an external perspective view of the scanner; FIG. 3 is an external perspective view of the scanner; FIG. FIG. 2 is a side cross-sectional view showing a document conveying path in the scanner; The perspective view of a lower unit. The perspective view of a lower sensor unit. FIG. 4 is an exploded perspective view of the lower sensor unit; FIG. 4 is an exploded perspective view of the lower sensor unit; Sectional drawing of a lower sensor unit. FIG. 4 is a partial cross-sectional perspective view of the lower sensor unit; FIG. 4 is a partial cross-sectional perspective view of the lower sensor unit; FIG. 4 is a partially cross-sectional perspective view of the upper sensor unit; FIG. 4 is a partial cross-sectional perspective view of the lower sensor unit; Partial perspective view inside the lower sensor unit. FIG. 4 is a perspective view of a conductive plate material and a shield cover; FIG. 4 is a cross-sectional perspective view of a rotating shaft of a transport drive roller and rotation detecting means;

The present invention will be briefly described below.
An image reading apparatus according to a first aspect includes a document transport path through which a document is transported, a transparent plate facing the surface of the document transported through the document transport path, and reading through which the surface of the document is read through the transparent plate. a reading unit including a sensor, wherein the reading unit includes a housing that houses the reading sensor and in which the transparent plate is provided at a position facing the document transport path; A circuit board provided on the opposite side of the position where the plate is provided and processing an output signal of the reading sensor, and a shield member covering the circuit board, and are arranged in directions approaching and separating from the document transport path. It has a surface extending in a certain first direction, a first end that is one end in the first direction faces the transparent plate, and a second end that is the other end in the first direction contacts the shield member. A conductive plate material having a contact portion is provided inside the housing, the circuit board has a GND pattern connected to GND, and the shield member contacts the GND pattern of the circuit board. It is characterized by

According to this aspect, a conductive plate member is provided inside the casing of the reading unit, the conductive plate member is in contact with the shield member covering the circuit board, and the shield member is the GND pattern of the circuit board. Since it is configured to be in contact with , there is no need for dedicated work or cables for connecting the conductive plate material to GND, and cost increase can be suppressed.

A second aspect is characterized in that, in the first aspect, the conductive plate member is provided upstream and downstream in the document conveying direction with respect to the reading sensor.
According to this aspect, the conductive plate member is provided upstream and downstream in the document transport direction with respect to the reading sensor, so that charging of the transparent plate can be eliminated more favorably.

A third aspect is the first or second aspect, wherein the distance between the first end of the conductive plate material and the transparent plate is narrower than the distance between the reading sensor and the transparent plate. Characterized by
According to this aspect, since the distance between the first end of the conductive plate material and the transparent plate is narrower than the distance between the reading sensor and the transparent plate, discharge from the transparent plate can be performed more reliably. Since the conductive plate material is discharged before the reading sensor, the reading sensor can be protected more reliably.

According to a fourth aspect, in any one of the first to third aspects, the flexural rigidity of the conductive plate member in the extending direction of the reading unit, which is the direction intersecting with the document conveying direction, is greater than the bending rigidity of the housing. It is characterized by being greater than the bending rigidity in the extending direction.
According to this aspect, the bending rigidity of the conductive plate member in the extending direction of the reading unit, which is the direction intersecting with the document conveying direction, is greater than the bending rigidity of the casing in the extending direction. Good reading quality can be obtained by suppressing the bending of the housing in the installation direction, and the conductive plate material also serves as a member for improving the strength of the housing, increasing the cost of the device. can be suppressed.

In a fifth aspect, in any one of the first to fourth aspects, the housing is provided with a slit for receiving the first end of the conductive plate member, and the slit cuts through the transparent plate. It is characterized by being closed by a tape material attached to the housing.
According to this aspect, the housing is provided with a slit for receiving the first end of the conductive plate material, and the slit is closed by a tape material for attaching the transparent plate to the housing. Therefore, entry of dust or the like into the housing through the slit can be suppressed.

A sixth aspect is any one of the first to fifth aspects, wherein a cover member for covering an opening of the housing is provided on the side opposite to the position where the transparent plate is provided in the housing; A connecting portion between the body and the cover member is formed by fitting a concave portion and a convex portion.
According to this aspect, a cover member that covers the opening of the housing is provided on the side opposite to the position where the transparent plate is provided in the housing, and the connecting portion between the housing and the cover member is a concave portion. and the projection, it is possible to prevent dust and the like from entering the housing through the connecting portion.

A seventh aspect is any one of the first to fifth aspects, wherein a cover member for covering an opening of the housing is provided on the opposite side of the position where the transparent plate is provided in the housing, and the conductive The second end portion of the elastic plate member is inserted into a recess provided in the cover member.
According to this aspect, a cover member that covers the opening of the housing is provided on the side opposite to the position where the transparent plate is provided in the housing, and the second end of the conductive plate member Since it enters into the concave portion provided in the cover member, it is possible to suppress the entry of dust and the like into the housing.

An eighth aspect is any one of the first to fifth aspects, wherein a cover member for covering an opening of the casing is provided on the side opposite to the position where the transparent plate is provided in the casing; A space is formed by connecting a first portion provided on the housing and a second portion provided on the cover member outside the connection portion between the body and the cover member.
According to this aspect, the cover member that covers the opening of the housing is provided on the side opposite to the position where the transparent plate is provided in the housing, and the cover member is provided outside the connecting portion between the housing and the cover member. Since a space is formed by the connection between the first portion provided on the housing and the second portion provided on the cover member, entry of dust or the like into the housing through the connection portion is suppressed. can.

The present invention will be specifically described below.
In the following, as an example of an image reading apparatus, a scanner 1 capable of reading at least one of the front side and the back side of a document will be taken as an example. The scanner 1 is a so-called document scanner that reads a document while moving it with respect to reading means.

In the XYZ coordinate system shown in each drawing, the X-axis direction is the width direction of the apparatus and the width direction of the document. The Y-axis direction is the depth direction of the apparatus and is the direction along the horizontal direction. The Z-axis direction is the direction along the vertical direction. The V-axis direction is a direction parallel to a document transport path T, which will be described later. However, the illustration of the Y-axis is omitted from FIG. 4 onward if it is not necessary.
In this embodiment, the +Y direction is the direction from the rear surface to the front surface of the device, and the -Y direction is the direction from the front surface to the rear surface of the device. Also, when viewed from the front of the device, the left side is the +X direction and the right side is the -X direction.
Further, hereinafter, the direction in which the document is conveyed (+V direction) may be called "downstream", and the opposite direction (-V direction) may be called "upstream".

1 to 3, the scanner 1 includes an apparatus main body 2 and a support base 5 that rotatably supports the apparatus main body 2. As shown in FIG.
The apparatus body 2 is configured with a lower unit 3 and an upper unit 4 .
The upper unit 4 can be opened and closed by rotating around a rotation shaft (not shown) with respect to the lower unit 3. By opening the upper unit 4 toward the front of the apparatus, a document transport path, which will be described later, is exposed. can be done.

The lower unit 3 that constitutes the apparatus main body 2 is rotatably provided to an arm portion 5a that constitutes the support base 5 via a rotating shaft 5b, and is configured to be able to change its posture by rotating.
The device main body 2 of the scanner 1 according to the present embodiment has three postures by posture holding means (not shown). and a second posture between the first posture and the third posture. 1 to 3 show the device body 2 in the second posture. The second posture and the third posture are postures when reading a document, and the first posture is a posture when not in use.

The upper unit 4 has a front cover 19 and the lower unit 3 has a top cover 10 . The front cover 19 is rotatably provided with respect to the upper unit 4, and can take a closed state as shown in FIG. 1 and an open state as shown in FIG. 2 by rotating. When the front cover 19 is opened, it functions as a document receiving tray for receiving documents that are read and discharged as shown in FIGS. 2 and 3 .

The upper unit 4 has, as shown in FIG. 2, an operation panel 7 on the upper surface of which a user interface (UI) is realized for performing various reading settings and reading execution operations, and for displaying the contents of reading settings and the like. . In this embodiment, the operation panel 7 is a so-called touch panel capable of both display and input, and serves both as an operation unit for performing various operations and as a display unit for displaying various information. The operation panel 7 is exposed by opening the front cover 19 .

The top cover 10 provided on the lower unit 3 is rotatably provided with respect to the lower unit 3, and by rotating, it can be closed as shown in FIG. 1 and opened as shown in FIGS. can be open to When the top cover 10 is opened, it functions as a document support tray that supports the document to be fed as shown in FIGS.
A feed opening 6 is provided in the upper part of the apparatus main body 2 , and the document placed on the top cover 10 is fed into the apparatus main body 2 through the feed opening 6 .

Reference numerals 12A and 12B in FIG. 2 denote edge guides for guiding the edges of the document in the X-axis direction. The edge guides 12A and 12B are provided so that they can approach or separate from each other by operating one of them by a rack and pinion mechanism (not shown).

Next, mainly referring to FIG. 3, the document transport path T in the scanner 1 will be described. A document transport path T shown in FIG. 3 is a document transport path when the apparatus main body 2 is in the above-described second posture. A document transport path T is a linear document transport path formed between the lower unit 3 and the upper unit 4 . The document transport path T extends obliquely downward from upstream to downstream when the apparatus body 2 is in the above-described second posture.

The top cover 10 described above is provided at the most upstream side of the document transport path T. Downstream of the top cover 10 are a feeding roller 14 for feeding the placed document downstream and a feeding roller 14 . A separation roller 15 is provided for nipping and separating the document between them. The feed roller 14 is in contact with the lower surface of the lowest document among the documents placed on the top cover 10 . Therefore, when a plurality of documents are placed on the top cover 10, they are fed downstream in order from the lowest document. The lower surface of the document placed on the upper surface cover 10 is the first surface facing the upper surface cover 10, and the opposite surface thereof is the second surface. The feeding roller 14 is in contact with the first side of the document, and the separation roller 15 is in contact with the second side of the document.

The feeding roller 14 receives rotational torque from a motor (not shown) and rotates counterclockwise in FIG. A rotational torque rotating counterclockwise in FIG. 3 is transmitted to the separation roller 15 from a motor (not shown) via a torque limiter 50 .

A transport roller pair 16 , a reading unit 20 as reading means for reading an original image, and a discharge roller pair 17 are provided downstream of the feeding roller 14 . The transport roller pair 16 includes a transport drive roller 16a that is rotationally driven by a motor (not shown) and a transport driven roller 16b that is driven to rotate.
The document nipped by the feed roller 14 and the separation roller 15 and fed downstream is nipped by the transport roller pair 16 and faces the upper sensor unit 20A and the lower sensor unit 20B located downstream of the transport roller pair 16. transported to position.

Here, as shown in FIG. 15, a rotary scale 45a is attached to the shaft end of the shaft 47 which is the rotation shaft of the transport driving roller 16a. The rotary scale 45a and the detection portion 45b constitute rotation detection means 45, and the control means (not shown) uses the detection signal of the rotation detection means 45 to grasp the rotation amount and rotation direction of the shaft 47. FIG.
A reference numeral 46 indicates a bearing, and a compression spring 48 is provided between the shaft 47 and the bearing 46 . The compression spring 48 exerts a pressing force in the X-axis direction between the shaft 47 and the bearing 46, and the shaft 47 is pressed by the compression spring 48 in the +X direction. With such a structure, the position of the shaft 47 in the X-axis direction is determined, the relative position between the rotary scale 45a and the detector 45b is stabilized, and appropriate rotation detection becomes possible.

Returning to FIG. 3 , the reading unit 20 is positioned above the document transport path T, and is positioned below the document transport path T, with the upper sensor unit 20A provided in the upper unit 4 and the lower unit 3 and a lower sensor unit 20B provided in. The upper sensor unit 20A and the lower sensor unit 20B are examples of reading units.
The upper sensor unit 20A has a sensor module 21A and the lower sensor unit 20B has a sensor module 21B. The sensor modules 21A and 21B are examples of reading sensors, and in this embodiment, the sensor modules 21A and 21B are contact image sensor modules (CISM).
The sensor module 21A located above the document transport path T reads the second surface, which is the upper surface of the document. One side is read.
The surface of the document read by the upper sensor unit 20A and the surface of the document read by the lower sensor unit 20B form a plane parallel to the document transport path T. As shown in FIG.

The upper sensor unit 20A has a background plate 22A at a position facing the sensor module 21B of the lower sensor unit 20B, and the lower sensor unit 20B has a background plate 22B at a position facing the sensor module 21A of the upper sensor unit 20A. I have.
The background plates 22A and 22B are reference plates that are read by opposing sensor modules for shading correction. be able to.

The background plates 22A and 22B are rotatably provided by the power of a motor (not shown). By rotating, the facing state where the facing sensor modules face each other as indicated by the solid line and the facing state as indicated by the chain double-dashed line. It can be switched to a non-facing state that cancels the state. As an example, the background plates 22A and 22B are white, and a white reference value can be obtained in the facing state, and a black reference value can be obtained in the non-facing state.
The configurations of the upper sensor unit 20A and the lower sensor unit 20B will be explained in detail again.

After the image of at least one of the first and second surfaces of the document is read by the reading section 20 , the document is nipped by a pair of discharge rollers 17 located downstream of the reading section 20 , and is delivered to the discharge port 18 . discharged from
The discharge roller pair 17 includes a discharge drive roller 17a that is driven to rotate by a motor (not shown) and a discharge driven roller 17b that is driven to rotate.

Next, the upper sensor unit 20A and the lower sensor unit 20B will be further described with reference to FIG. 4 and subsequent figures. Since the basic configurations of the upper sensor unit 20A and the lower sensor unit 20B are the same, the configuration of the lower sensor unit 20B will be mainly described below.
4 to 10, 12 and 13 show the configuration of the lower sensor unit 20B, and FIG. 11 shows the configuration of the upper sensor unit 20A. Only the configuration shown in FIG. 11 will be described using the upper sensor unit 20A as an example.

4 to 6, the lower sensor unit 20B has an outer shell formed by a housing 24, and as shown in FIG. , 13 form a document transport path. Hereinafter, the thickness direction of the glass plate 23, in other words, the direction toward and away from the document transport path (vertical direction in FIG. 8) will be referred to as a first direction. The extending direction of the sensor module 21B is the X-axis direction.

As shown in FIGS. 5 and 6, the lower sensor unit 20B includes a housing 24, a glass plate 23 provided at a position facing the document transport path T with respect to the housing 24, and a sensor module housed in the housing 24. 21B, a cover member 25 provided on the opposite side of the housing 24 to the position where the glass plate 23 is provided and covering the lower opening of the housing 24 in FIG. 6, and the glass plate 23 is provided for the sensor module 21B. A circuit board 27 is provided on the opposite side of the position where the sensor module 21B is provided, and a shield cover 28 that covers the circuit board 27 and performs electromagnetic shielding is provided. The lower sensor unit 20B also includes conductive plate members 29A and 29B inside the housing 24 . In FIG. 6, the conductive plate members 29A and 29B are accommodated inside the housing 24. As shown in FIG. FIG. 7 shows a state in which the conductive plate members 29A and 29B are removed from the housing 24. As shown in FIG.

The housing 24, the glass plate 23, the sensor module 21B, the cover member 25, and the conductive plate members 29A and 29B are extended in the X-axis direction.
In this embodiment, the housing 24 and the cover member 25 are made of a resin material, and the shield cover 28 is made of a metal plate material having electromagnetic wave shielding performance. The conductive plate members 29A and 29B are made of conductive metal plates.

The conductive plate material 29A is located upstream of the sensor module 21B in the document transport direction, and the conductive plate material 29B is located downstream of the sensor module 21B in the document transport direction.
The conductive plate members 29A and 29B form surfaces extending in the first direction and extend in the X-axis direction, and as shown in FIG. A second end portion 29 d that is the other end in the first direction faces the cover member 25 .

As shown in FIG. 8, the interior of the housing 24 is partitioned into an arrangement area for the sensor module 21B and an arrangement area for the background plate 22B along the document transport direction. By rotating around the shaft 31, the background plate 22B switches between a facing state in which it faces the facing sensor module 21A as described with reference to FIG. 3 and a non-facing state in which the facing state is canceled.
Here, as shown in FIGS. 8 and 13, a torsion spring 42 is provided at the end of the background plate 22B in the X-axis direction. is applied to the background plate 22B so as to maintain the posture of

A first arm portion 42a, which is one end of the torsion spring 42, is engaged with the inner wall 24c of the housing 24, and a second arm portion 42b, which is the other end of the torsion spring 42, is engaged with the X-axis direction end of the background plate 22B. It is engaged with a pressed member 43 provided on the portion. The torsion spring 42 switches its orientation as the background plate 22B rotates.
At this time, if the first arm portion 42a is displaced while being in contact with the inner wall 24c of the housing 24, the inner wall 24c may be scraped off and shavings may be generated. may adversely affect
Therefore, in this embodiment, the spacer 34 is provided to keep the first arm portion 42a away from the inner wall 24c of the housing 24. As shown in FIG. The spacer 34 has a low coefficient of friction with the first arm portion 42a and is made of a resin material that does not generate shavings due to friction with the first arm portion 42a. Note that the spacers 34 may be formed of a metal material instead of such a resin material.
As described above, the possibility that the rotation of the background plate 22B adversely affects the reading result is suppressed.

Next, a structure for suppressing entry of dust into the housing 24 will be described. If dust or the like enters the housing 24 and adheres to the rear surface of the glass plate 23, it adversely affects the reading result. Basically, the cover member 25 is fixed to the housing 24 with some screws.
9 to 12 show connection portions between the housing 24 and the cover member 25 located on the opposite side of the housing 24 from the position where the glass plate 23 is provided. A connecting portion between the housing 24 and the cover member 25 is configured by one of the structures shown in FIGS. 9 to 12. FIG.
In FIG. 9 , the connecting portion between the housing 24 and the cover member 25 is formed by fitting a concave portion 25 a provided on the cover member 25 and a convex portion 24 b provided on the housing 24 . Such a structure complicates the entry path of dust and the like into the housing 24 , thereby suppressing the entry of dust and the like into the housing 24 .

In FIG. 10 , the second end 29d of the conductive plate material 29B enters the recess 25b provided in the cover member 25. As shown in FIG. As a result, entry of dust or the like into the housing 24 can be suppressed. Reference numeral 38 denotes screws for fixing the cover member 25 to the housing 24. As shown in FIG. The structure shown in FIG. 10 is suitable when the structure shown in FIG. 9 cannot be adopted in terms of space.

In FIG. 11, a space 26 is formed by connecting a first portion 24e provided on the housing 24 and a second portion 25c provided on the cover member 25 outside the connecting portion between the housing 24 and the cover member 25. be done. With such a structure, the entry path of dust and the like into the housing 24 is lengthened, and entry of dust and the like into the housing 24 can be suppressed.

In FIG. 12, a tape material 37 is attached to the connecting portion between the housing 24 and the cover member 25 . The tape material 37 can more reliably fix the cover member 25 to the housing 25 and prevent dust from entering the housing 24 .

Next, the conductive plate members 29A and 29B will be explained. In this embodiment, the conductive plate members 29A and 29B are made of metal plates, and the bending rigidity of the conductive plate members in the X-axis direction is greater than the bending rigidity of the housing 24 in the X-axis direction. Thereby, bending of the housing 24 in the X-axis direction, that is, the lower sensor unit 20B can be suppressed, and good reading quality can be obtained. Even if the bending rigidity of the conductive plate material in the X-axis direction is less than or equal to the bending rigidity of the housing 24 in the X-axis direction, it contributes to improving the bending rigidity of the housing 24, that is, the lower sensor unit 20B in the X-axis direction. Therefore, deterioration in reading quality can be suppressed.
As will be described later, the conductive plate member 29A has a function of receiving static electricity discharged from the glass plate 23. Thus, the conductive plate member 29A has a function of improving the strength of the housing 24 and a function of discharging static electricity from the glass plate 23. Since it also has the function of receiving static electricity, it is possible to suppress the cost increase of the device.

In this embodiment, of the conductive plate members 29A and 29B, the conductive plate member 29A provided at a position closer to the sensor module 21B has a contact portion 29e formed at a second end portion 29d as shown in FIG. As shown in FIG. 14, it contacts the contact portion 28b of the shield cover 28 in the assembly state of the lower sensor unit 20B.
Further, a contact portion 28 a is formed on the shield cover 28 , and the contact portion 28 a is in contact with a GND pattern 27 a provided on the circuit board 27 . A cable 30 (see FIG. 5) is connected to the circuit board 27, and the GND pattern 27a is connected to GND via the GND line of the cable 30. FIG.
Such a structure eliminates the need for dedicated work for connecting the conductive plate material 29A to the GND and members such as cables, thereby suppressing cost increases.

In this embodiment, of the conductive plate members 29A and 29B, the conductive plate member 29A provided near the sensor module 21B is in contact with the shield cover 28, but the conductive plate member 29B is also shielded. It may be configured to contact the cover 28 . That is, by providing the conductive plate members connected to GND upstream and downstream in the document conveying direction with respect to the sensor module 21B, the charging of the glass plate 23 can be eliminated more satisfactorily.
Conversely, a non-conductive plate material may be used instead of the conductive plate material 29B. This is because at least the plate material at a position near the sensor module 21B is electrically conductive, thereby effectively suppressing discharge from the glass plate 23 to the sensor module 21B.

Further, in this embodiment, the distance between the first end portion 29c of the conductive plate member 29A and the glass plate 23 is configured to be narrower than the distance between the sensor module 21B and the glass plate 23. FIG. Position H1 in FIG. 8 indicates the position where the first end 29c is closest to the glass plate 23 in the thickness direction of the glass plate 23, and position H2 indicates the position where the sensor module 21B is closest to the glass plate 23 in the thickness direction of the glass plate 23. showing the position.
With such a structure, when the electric discharge is discharged from the glass plate 23, the electric discharge is surely discharged to the conductive plate material 29A before the sensor module 21B, and the sensor module 21B can be protected more surely.

It goes without saying that the present invention is not limited to the above-described embodiments, and that various modifications are possible within the scope of the invention described in the claims, which are also included in the scope of the present invention. stomach.

DESCRIPTION OF SYMBOLS 1... Scanner, 2... Apparatus main body, 3... Lower unit, 4... Upper unit, 5... Ejection tray, 6... Feed port, 7... Operation panel, 10... Top cover, 11... Path formation member, 12A, 12B Edge guide 13 Path forming member 14 Feed roller 15 Separation roller 16 Transport roller pair 16a Transport drive roller 16b Transport driven roller 17 Ejection roller pair 17a Ejection drive roller , 17b... discharge driven roller, 18... discharge port, 19... front cover, 20... reading unit, 20A... upper sensor unit, 20B... lower sensor unit, 21A, 21B... sensor modules 21A, 22B... background plate, 23... glass Plate 24 Housing 24c Inner wall 24d Slit 24e First portion 24f Convex portion 25 Cover member 25a Concave portion 25b Concave portion 25c Second portion 26 Space 27 Circuit board 28 Shield cover 29A, 29B Conductive plate material 29c First end 29d Second end 29e Contact part 30 Cable 31 Shaft 33 Coil spring DESCRIPTION OF SYMBOLS 34... Spacer 36... Double-sided tape 37... Tape material 38... Screw 42... Torsion spring 42a... First arm part 42b... Second arm part 43... Pressed member 45... Rotation detecting means 45a ... rotary scale, 45b ... detector, 46 ... bearing, 47 ... shaft, 48 ... compression spring

Claims (7)

a document transport path along which the document is transported;
a reading unit including a transparent plate facing the surface of the document conveyed on the document conveying path and a reading sensor that reads the surface of the document through the transparent plate;
The reading unit includes a housing that houses the reading sensor and that is provided with the transparent plate at a position facing the document transport path;
a circuit board provided on the side opposite to the position where the transparent plate is provided with respect to the reading sensor and processing an output signal of the reading sensor;
and a shield member covering the circuit board,
It has a surface extending in a first direction that is a direction approaching and separating from the document transport path, and a first end that is one end in the first direction faces the transparent plate and the other end in the first direction. A conductive plate member having a contact portion that contacts the shield member at a second end of is provided inside the housing,
The circuit board has a GND pattern connected to GND,
the shield member is in contact with the GND pattern of the circuit board;
bending rigidity of the conductive plate member in the extending direction of the reading unit, which is a direction intersecting with the document transport direction, is greater than bending rigidity of the housing in the extending direction;
An image reading device characterized by: a document transport path along which the document is transported;
a reading unit including a transparent plate facing the surface of the document conveyed on the document conveying path and a reading sensor that reads the surface of the document through the transparent plate;
The reading unit includes a housing that houses the reading sensor and that is provided with the transparent plate at a position facing the document transport path;
a circuit board provided on the side opposite to the position where the transparent plate is provided with respect to the reading sensor and processing an output signal of the reading sensor;
and a shield member covering the circuit board,
It has a surface extending in a first direction that is a direction approaching and separating from the document transport path, and a first end that is one end in the first direction faces the transparent plate and the other end in the first direction. A conductive plate member having a contact portion that contacts the shield member at a second end of is provided inside the housing,
The circuit board has a GND pattern connected to GND,
the shield member is in contact with the GND pattern of the circuit board;
The housing is provided with a slit for receiving the first end of the conductive plate material,
The slit is closed by a tape material for attaching the transparent plate to the housing.
An image reading device characterized by: a document transport path along which the document is transported;
a reading unit including a transparent plate facing the surface of the document conveyed on the document conveying path and a reading sensor that reads the surface of the document through the transparent plate;
The reading unit includes a housing that houses the reading sensor and that is provided with the transparent plate at a position facing the document transport path;
a circuit board provided on the side opposite to the position where the transparent plate is provided with respect to the reading sensor and processing an output signal of the reading sensor;
and a shield member covering the circuit board,
It has a surface extending in a first direction that is a direction approaching and separating from the document transport path, and a first end that is one end in the first direction faces the transparent plate and the other end in the first direction. A conductive plate member having a contact portion that contacts the shield member at a second end of is provided inside the housing,
The circuit board has a GND pattern connected to GND,
the shield member is in contact with the GND pattern of the circuit board;
A cover member covering an opening of the housing is provided on the side opposite to the position where the transparent plate is provided in the housing,
a connecting portion between the housing and the cover member is configured by fitting a concave portion and a convex portion;
An image reading device characterized by: a document transport path along which the document is transported;
a reading unit including a transparent plate facing the surface of the document conveyed on the document conveying path and a reading sensor that reads the surface of the document through the transparent plate;
The reading unit includes a housing that houses the reading sensor and that is provided with the transparent plate at a position facing the document transport path;
a circuit board provided on the side opposite to the position where the transparent plate is provided with respect to the reading sensor and processing an output signal of the reading sensor;
and a shield member covering the circuit board,
It has a surface extending in a first direction that is a direction approaching and separating from the document transport path, and a first end that is one end in the first direction faces the transparent plate and the other end in the first direction. A conductive plate member having a contact portion that contacts the shield member at a second end of is provided inside the housing,
The circuit board has a GND pattern connected to GND,
the shield member is in contact with the GND pattern of the circuit board;
A cover member covering an opening of the housing is provided on the side opposite to the position where the transparent plate is provided in the housing,
A space is formed outside a connecting portion between the housing and the cover member by connecting a first portion provided on the housing and a second portion provided on the cover member,
An image reading device characterized by: 5. The image reading device according to any one of claims 1 to 4 , wherein the conductive plate member is provided upstream and downstream of the reading sensor in the document conveying direction.
An image reading device characterized by: 6. The image reading device according to claim 1, wherein the distance between the first end of the conductive plate and the transparent plate is equal to the distance between the reading sensor and the transparent plate. narrower,
An image reading device characterized by: 3. The image reading device according to claim 1 , wherein a cover member is provided on the opposite side of the housing from the position where the transparent plate is provided to cover the opening of the housing,
the second end of the conductive plate material enters a recess provided in the cover member;
An image reading device characterized by:

Images